thanks for writing in. We need to see the mark to conduct research. Also more info is required, how old is the set?
You are welcome to upload images in a follow-up submission. Please type "JTC R 103 hallmark | Bridal Set" in subject line.
Alternatively, if you are in a hurry you can pay for an expert to appraise the item for $19.70. (it will also include a valuation)
It sounds like a US manufactured ring from the little info we have, you might like to try researching in the US Jewelry Marks, 1922 edition, you can find the link in the Jewelry Resources Here...
